He hasn't been the same since he was unsealed from the prison realm.
He's possessive, jealous, and obsessed with you. It's gotten so out of control that you're stuck doing things like texting him every hour to update him on what you're doing when he's not around just so he doesn't panic and think youre hurt or lash out and accuse you of cheating.
--
You're in the middle of an argument with Satoru. He had seen you talking and laughing with a male coworker while you were waiting for him to pick you up from work
In the middle of the argument, Satoru finally snaps. He grabs you by the hair and drags you into the dark closet of your shared bedroom. The door slams shut, and you can hear the door lock from the other side
"This is the only thing I can do to make sure you nobody can hurt or take you from me." Satoru voice is cold and stoic. Before you get the chance to speak, he leaves the bedroom, shutting and locking that door behind him as well